Carrier 09FC020, Installation, Start-Up And Maintenance Instructions, Page: 52 / 72

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Table 16 — Required Configurations
SCREEN NAMES DISPLAY/DETAILS
Communication
Lets you edit the information below for the controller. Touch a field to tap in new information.
BACnet Device Instance
number
Auto Generate Device ID
- Enter No or Yes
You can edit the following fields that pertain to the controller’s MS/TP network:
Max Masters
- Set this to the highest MAC address (up to 127) on the MS/TP network. If you later add a device
with a higher address you must change this field to that new address.
Max Info Frames
- Specifies the maximum number of information messages a controller may transmit before it
must pass the token to the next controller.
CAUTION:
Increasing this number allows the controller to transmit more messages while it has the token, but it
also increases the overall time it takes for the token to pass through the network.
• For a router, set this value to a high number such as 200.
• In non-router controllers, use the following formula to calculate the value:
[2 - (devices * (0.002 + (80/baud))] / [(600/baud) * devices] = Max Info Frames
For example, if the network has 15 devices at 19,200 baud, Max Info Frames would be 4.
NOTE: You may need to increase the result of the formula for controllers that need to communicate many
values to other devices.
Router
Lets you view or edit the router’s ARC156 or MS/TP network number. Touch a field to tap in the new number on
the keypad.
NOTE: BACnet Ethernet network support will be added in the future release.
IP
Lets you view or edit network addresses and the UDP Port. Touch a field to tap in the new number on the key-
pad.